Replace load-generator with Go implementation

[HarshitNagpal29]

• Replace python load-generator with a Go implementation.
• Add additional PromQL tests.

Fixes #688
Fixes #705

[HarshitNagpal29]

@SuperQ Sir, can you please check it once?

[SuperQ]

We don't do builds in Docker here. What you want to do is add the new tool to the top level .promu.yml. Take a look at tools/fake-webserver/Dockerfile for an example.

[SuperQ]

This needs a DCO sign-off. You can use git commit -s --amend to add it.

[HarshitNagpal29]

@SuperQ Sir first of all really sorry for not clarifying properly about PR, yes it resolved 2 issues this one and #705. I have a seperate PR for #705 as well but no was reviewing it.

Also the changes you suggested I will make in few hour and commit changes, and will see why tests are failing, and try to resolve it.

[SuperQ]

We generally don't review if tests are failing.

[HarshitNagpal29]

Also sir can you look for issue #594 once, like I have proposed it's solution and not created PR, I have mentioned everything there once you can check I have ready solution in python I will create it in go aswell.
@SuperQ

[HarshitNagpal29]

@SuperQ Sir i have made the changes as suggested by you, PTAl.

[HarshitNagpal29]

i dont know why DCO is failing even after git commit -s --amend

[SuperQ]

Each individual commit must be signed off. You can use git rebase -i origin/master to squash your commits.

[HarshitNagpal29]

@SuperQ Hi Sir, hope you are doing well, I was having multiple issues even after rebasing so I have created a new PR #743 signing and it has passed DCO, please review and approve the changes.

[HarshitNagpal2901]

@SuperQ Sir can I close this PR? and you can merge another one, is it fine?

[SuperQ]

Superseded by #748